如图①是实验室中的一种摆动装置,
在地面上,支架
是底边为
的等腰直角三角形,摆动臂
可绕点
旋转,摆动臂
可绕点
旋转,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/262bbe05-e145-4e4c-8ea1-cf40bcf1a83f.png?resizew=364)
(1)在旋转过程中.
①当
、
、
三点在同一直线上时,
的长为________;
②当
、
、
三点为同一直角三角形的顶点时,
的长为________;
(2)若摆动臂
顺时针旋转
,点
的位置由
外的点
转到其内的点
处,连接
.如图②,此时
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18b5e7ad8fde2001e99ae54838adb9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f9157ab0a8ed704bcd1b4219f06ec1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/262bbe05-e145-4e4c-8ea1-cf40bcf1a83f.png?resizew=364)
(1)在旋转过程中.
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)若摆动臂
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853fbd1fab19c4df6131004231abeea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200ab28a3c3df719c19f23b35d9fca04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53447e140bc93170b13cf58a4f5b2d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177c27d20eef8a55f55232be139fc0b1.png)
更新时间:2024-01-21 00:17:26
|
相似题推荐
解答题-证明题
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【推荐1】如图,在△ABC中,∠C=90°,AD所在直线是∠BAC的对称轴,DE⊥AB于E,点F在AC上,BD=DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/c9209d21-8814-4020-89d2-c9142ca82b0d.png?resizew=164)
求证:(1)DC=DE;
(2)CF="EB."
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/c9209d21-8814-4020-89d2-c9142ca82b0d.png?resizew=164)
求证:(1)DC=DE;
(2)CF="EB."
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【推荐2】定义:若一个四边形满足三个条件①有一组对角互补,②一组邻边相等,③相等邻边的夹角为直角,则称这样的四边形为“直角等邻对补”四边形,简称为“直等补”四边形.根据以上定义,解答下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/fd6becda-4242-4835-859c-42a948d57e82.png?resizew=312)
(1)如图1,四边形
是正方形,点
在
边上,点
在
边的延长线上,且
,连接
,
,请根据定义判断四边形
是否是“直等补”四边形,并说明理由.
(2)如图2,已知四边形
是“直等补”四边形,
,
于点
,若
,
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/fd6becda-4242-4835-859c-42a948d57e82.png?resizew=312)
(1)如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(2)如图2,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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名校
【推荐1】如图所示,在大楼
的正前方有一斜坡
(坡角
),在它们之间有一片水域,现要测量大楼
的高度.小明在斜坡上的点D处利用热气球探测器测得楼顶点B处的仰角为
;当热气球探测器竖直向上上升到点F处,测得楼顶点B处的仰角为
;已知
米,
米,其中点
在同一直线上.(参考数据:
,
)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/80bf113f-69ad-48dd-9bd2-85a4ead930ea.png?resizew=123)
(1)求斜坡
的高度
(精确到十分位);
(2)求大楼
的高度(精确到十分位).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0f43fdf6c0dc08f2cf7fdaba21a847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7435836899f6cd9fd01d84568b02239e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9332f323c9a188e691fe9bf62083a0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a157b1273d27ec0d809662a26d62c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c4d5ff9b34c710d482ea71b0398018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ff30509b121897e5303a3c2477b629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b403383ec1172f9e5b68ab4d2cd2d59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7fee1accb4c0ff73821618c4d70184.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/80bf113f-69ad-48dd-9bd2-85a4ead930ea.png?resizew=123)
(1)求斜坡
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求大楼
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,共顶点的两个三角形△ABC,△AB′C′,若AB=AB′,AC=AC′,且∠BAC+∠B′AC′=180°,我们称△ABC与△AB′C′互为“顶补三角形”.
(2)在(1)的条件下,BE与CD交于点F,连接AF并延长交BC于点G.判断DE与AG的数量关系,并证明你的结论.
(3)如图3,四边形ABCD中,∠B=40°,∠C=50°.在平面内是否存在点P,使△PAD与△PBC互为顶补三角形,若存在,请画出图形,并证明;若不存在,请说明理由.
(2)在(1)的条件下,BE与CD交于点F,连接AF并延长交BC于点G.判断DE与AG的数量关系,并证明你的结论.
(3)如图3,四边形ABCD中,∠B=40°,∠C=50°.在平面内是否存在点P,使△PAD与△PBC互为顶补三角形,若存在,请画出图形,并证明;若不存在,请说明理由.
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【推荐1】如图,在Rt△ABC中,∠ABC=90°,CD⊥BC,BD与AC相交于点E,AB=9,BC=4,DC=3.
![](https://img.xkw.com/dksih/QBM/2016/3/11/1573984068616192/1573984074743808/STEM/874518fd992c49f3907d19b2b32feec9.png)
(1)求BE的长度;
(2)求△ABE的面积.
![](https://img.xkw.com/dksih/QBM/2016/3/11/1573984068616192/1573984074743808/STEM/874518fd992c49f3907d19b2b32feec9.png)
(1)求BE的长度;
(2)求△ABE的面积.
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【推荐2】随着科技的不断进步,人们已进入自动机械时代,“铰链结构”是一种可用于机械轧机,使其能够开启和关闭的连杆式装置(如图为平面示意图),凹槽MN安装在机床上,支点B,C,D始终在一条直线上,已知托臂
,托臂
,当CA垂直于凹槽时(如图1),“铰链结构”达到最大张角,此时将滑块A向左侧移动(在移动过程中,托臂长度不变),当
时,“铰链结构”达到最小张角,A到达最左端(如图2),求凹槽MN上的滑轨距离(即点A滑动距离).
(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875c41c535c7ffd887e9329d932ec4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720cf0c17cd163f804497aeee03b5828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2839477e940f58008b84f82c09c24d.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833b8f9664f7b463e278a00aa48c418f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/ccc95c99-3cf8-468c-bf99-f4d39dcd17be.png?resizew=383)
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【推荐1】如图
是十五中行政楼的推拉门,已知门的宽度
米,且两扇门的大小相同(即
),将左边的门
绕门轴
向里面旋转
,将右边的门
绕门轴
向外面旋转
,其示意图如图
(参考数据:
,
,
)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/31076a56-da73-4236-8f5d-dcec4cf48dcb.png?resizew=303)
(1)求开门过程中B与C走过的路径之和;
(2)此时B与C之间的距离为多少?(结果保留一位小数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1845ed03ec08feac9adee161aab3449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd0caec008c15302ca973b8e655b748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08bcb07c6b210eb418ca2b9e7cc81b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c070b66bd9255b8117a5896e56f05f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a929d0d84e3654f03694adc8d1a326e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/31076a56-da73-4236-8f5d-dcec4cf48dcb.png?resizew=303)
(1)求开门过程中B与C走过的路径之和;
(2)此时B与C之间的距离为多少?(结果保留一位小数)
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【推荐2】综合与实践
问题背景
在一次综合与实践课上,老师让同学们以两个全等的三角形纸片为操作对象,进行相关问题的研究,下面是创新小组在操作纸片过程中研究的问题,请你解决这些问题.
如图1,
,其中
,
,
.
操作与发现
(1)如图2,创新小组将两张三角形纸片按如图所示的方式放置后,经过观察发现四边形
是矩形,请你证明这个结论.
操作与探究
(2)创新小组在图2的基础上,将
纸片沿
方向平移至如图3的位置,其中点
与
的中点重合,连接
,
,经过探究后发现四边形
是菱形,请你证明这个结论.
(3)创新小组在图3的基础上又进行了探究,将
纸片绕点
逆时针旋转至
与
平行的位置,如图4所示,连接
,
.创新小组经过观察与推理后发现四边形
是矩形,请你证明这个结论.
提出问题
(4)请你参照以上操作,在图2的基础上,通过平移或旋转
构造出新的图形,在图5中画出这个图形,标明字母,说明构图方法,写出你发现的结论,不必证明.
问题背景
在一次综合与实践课上,老师让同学们以两个全等的三角形纸片为操作对象,进行相关问题的研究,下面是创新小组在操作纸片过程中研究的问题,请你解决这些问题.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac61f3477e623aa4f924a82bd7a06ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
操作与发现
(1)如图2,创新小组将两张三角形纸片按如图所示的方式放置后,经过观察发现四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31c3a9dc3437c6309cec6486ce42c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/48382294-d0b9-44bb-a737-3725253675e0.png?resizew=605)
操作与探究
(2)创新小组在图2的基础上,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
(3)创新小组在图3的基础上又进行了探究,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31c3a9dc3437c6309cec6486ce42c94.png)
提出问题
(4)请你参照以上操作,在图2的基础上,通过平移或旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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